CN117227593A - Motor vehicle seat - Google Patents

Abstract

The utility model relates to a motor vehicle seat (1), comprising: a seat cushion frame (3) having a seat cushion-side frame portion (5) and supported at a height H relative to the floor by a four-bar mechanism with front and rear coupling swing arms (9); a back frame (4) having a back-side frame portion (6). The height H of the seat cushion frame (3) can be changed by a seat height-adjusting device. The inclination of the backrest frame (4) relative to the seat cushion frame (3) can be varied about an adjustment axis by means of a backrest inclination adjustment device (17). A connecting tube (25) connects the two seat cushion-side frame portions (5) to each other. The connecting pipe (25) is also connected with the rear coupling rocker arm (9). According to the utility model, the adjustment axis extends through a cross section of the connecting tube (25).

Description

Motor vehicle seats

Technical field

The invention relates to a motor vehicle seat, in particular to a load-bearing structure of a motor vehicle seat, which includes a seat cushion frame, a backrest frame and a backrest inclination-adjusting device and a seat height-adjusting device.

Background technique

Support structures for motor vehicle seats are known, for example, from publications US 11 214 180 B1 and KR 2021/0067583 A.

Contents of the invention

The task of the present invention is to propose a motor vehicle seat, in particular a load-bearing structure of a motor vehicle seat, which motor vehicle seat or the load-bearing structure is improved in particular in the following aspects:

-Compact construction and/or

- space under the vehicle seat for the front feet of a person sitting behind the vehicle seat, and/or

- packaging and/or

-Kinematics and/or

-Absorption and distribution of force.

According to the invention, the object of the invention is solved by the features of preferred embodiments. Further preferred configurations of the invention emerge from alternative embodiments.

The motor vehicle seat of the present invention has a seat cushion frame and a backrest frame. The seat frame has seat-side frame sections. The seat frame, in particular the seat-side frame part, is supported by a four-bar mechanism with front and rear coupling rockers at a height H relative to the floor, in particular a longitudinal rail supported on the floor. The backrest frame has backrest-side frame sections.

Furthermore, in the motor vehicle seat according to the invention, there is a seat height adjustment device, by means of which the height H of the seat cushion frame can be changed (manually or electrically), wherein the height change can also be accompanied by Changes in the inclination of the seat cushion frame. Furthermore, the motor vehicle seat has a (manual or electric) backrest inclination adjustment device, by means of which a change in inclination of the backrest frame relative to the seat cushion frame about the adjustment axis can be achieved.

The motor vehicle seat according to the invention has a connecting tube which connects two seat cushion-side frame parts to one another. Furthermore, this connecting tube is connected to the coupling rocker arm. Here, it is possible to fasten the connecting tube to the coupling rocker arm without any remaining degrees of freedom, wherein the connecting tube is preferably mounted rotatably relative to the two seat cushion-side frame parts. Alternatively, it is also possible that the connecting tube is connected to the seat cushion-side frame part without degrees of freedom, whereas the connection of the connecting tube to the coupling rocker arm can take place via a rotational degree of freedom.

The invention proposes that the adjustment axis of the backrest inclination adjustment device passes through the cross section of the connecting tube. The connecting tube can have any hollow cross-section, in which case the adjusting axis can pass through the inner space of the connecting tube.

The invention is based on the knowledge that, with the embodiments disclosed from the prior art, the seat cushion-side frame parts are firmly connected to each other in the rear end region by a connecting tube and that the continuation of the seat cushion-side frame part extends from the connecting tube at least Extend upwards with one component. The backrest inclination adjustment device and its adjustment axis are then arranged in the region of these continuations (spaced from the connecting tube). This known configuration leads to many limitations. For example, these known embodiments may require the backrest and its cushion to start at a greater height, which may be detrimental to the position when the backrest is adjusted to a lying position in which the backrest and seat cushion are arranged almost on the same plane. Create a gap between the backrests and/or create a comfortable lying surface. Furthermore, this configuration results in a large amount of construction space in the rear end region of the motor vehicle seat, since on the one hand the connecting tube and the relevant subsection of the seat cushion frame and on the other hand the backrest inclination adjustment device are connected to each other. Designed separately and must be arranged one on top of the other. This is disadvantageous, for example, if a compact motor vehicle seat is to be provided in the rear end region of the seat cushion frame and the transition region to the backrest frame and in the region of the backrest inclination adjustment device. The structural space required for this configuration also limits the free space on the rear side of the motor vehicle seat between the underside of the seat cushion frame and the floor. However, in order to accommodate a person seated in the rear seat behind the motor vehicle seat The forefoot area, this is necessary or advantageous. According to the invention, a compact construction space with good packaging can be provided by the fact that the adjustment axis of the backrest inclination adjustment device passes through the cross section of the connecting tube.

Within the framework of the invention, the backrest inclination adjustment device can include a right backrest inclination adjustment unit and a left backrest inclination adjustment unit, wherein these backrest inclination adjustment units can each have their own manually or electrically actuated drive and / Or can have the same or different functional scope. According to a proposal of the invention, the right backrest inclination-adjusting unit and the left backrest inclination-adjusting unit can be coupled or connected to each other via a coupling rod. On the one hand, the coupling rod can play the role of ensuring a rigid support of the backrest when at least one backrest inclination adjustment unit is locked, in which case the two backrest inclination-adjustment units can jointly ensure the same by the coupling rod the inclination. On the other hand, the purpose of the coupling rod is to ensure that the tilt angle of both backrest tilt-adjustment units is the same when only one backrest tilt-adjustment unit or two backrest tilt-adjustment units are adjusted manually or electrically. And stay the same.

According to one suggestion of the invention, the coupling rod can extend through the connecting tube, which also allows for a compact design with good packaging. In addition, the connecting tube can provide a certain protective function for the coupling rod extending through it.

Within the framework of the invention, it is entirely possible for the adjusting axis and/or the coupling rod to extend through the connecting tube centrally or coaxially with respect to its longitudinal axis or line of symmetry. For a particular proposal of the invention, the adjusting axis and/or the coupling rod extend through the connecting tube offset relative to the longitudinal axis or the axis of symmetry. In this way, the utilization of the narrow available installation space can be further improved. For example, a relatively large backrest inclination can be avoided if the adjustment axis and/or the coupling rod are offset forward in the horizontal direction relative to the longitudinal axis or the axis of symmetry of the connecting tube - the adjustment device extends beyond the rear of the motor vehicle seat. The sides, here in particular, extend over the backrest. If the adjusting axis and/or the coupling rod are arranged with a downward offset in the vertical direction relative to the longitudinal axis or the axis of symmetry of the connecting tube, the backrest and the backrest frame are thereby displaced further downwards. In some cases, the above two types of offsets can also help to make the manually operated parts of the backrest tilt-adjustment device more accessible to the user. It can be understood that the offset may have two different offset components, namely an offset component in a horizontal direction (preferably forward) and an offset component in a vertical direction (preferably downward).

For the motor vehicle seat according to the invention, it is proposed that the seat cushion-side frame part be constructed in a Y-shape or fork-shape with one base leg and two fork legs. The base legs on the one hand and the fork legs on the other hand can have complex cross-sections and be designed, for example, as molded parts, pressed parts, profiled parts or as open or closed hollow profiles. The two fork legs can serve different purposes: it is possible for one fork leg to be connected to the seat height adjustment or to the rear coupling rocker, wherein this connection can ensure, for example, a degree of freedom of rotation about the transverse axis. The function of this fork leg is then to transmit the seat height holding force and/or the seat height adjustment force of the seat height adjustment device or the coupling rocker arm to the seat cushion-side frame part or to be supported on the seat cushion-side frame part superior. In this case, the other fork leg is connected to the backrest tilt adjustment device, wherein this fork leg can support or be connected to a gear element of the backrest tilt adjustment device. In this case, the function of this further fork leg is to transmit the backrest inclination maintaining force and/or the backrest inclination adjusting force to the seat cushion-side frame part or to be supported thereon. Therefore, for this configuration of the invention, the seat cushion-side frame part is used multifunctionally, since together with the two fork legs it serves to ensure the seat height on the one hand and the backrest inclination on the other hand.

Preferably, the backrest-side frame part is arranged between two fork legs of the seat cushion-side frame part such that these fork legs partially embrace the backrest-side frame part from the front side in a fork-like manner. The fork legs can be curved or meandering in such a way that the end regions remote from the base leg are oriented parallel to one another or support eyes can be formed parallel to one another. Within the framework of the invention, the fork legs can each have a bearing eye, wherein in addition the backrest-side frame part can also have bearing eyes. The bearing eyes of the inner fork leg are used here in particular for connection to the connecting tube, while the bearing eyes of the other fork leg and the bearing eyes of the backrest-side frame part are used in particular for receiving components and connecting them to components of the backrest inclination adjustment device. connect. Although in principle the bearing eye axes of the fork legs can be oriented coaxially with each other, these bearing eyes are preferably arranged offset from each other, which allows for the advantages of the offset explained above.

The invention also proposes that the adjustment gear of the backrest inclination adjustment device or its gear part is accommodated in a "sandwich" manner between the fork legs (arranged internally and/or externally) and the backrest side frame part, Guidance can be provided by associated support eyes. It is possible that in the transverse direction the gearing elements of the adjusting gearing or gearing part can be captured and/or guided between the fork legs and the backrest-side frame part and/or they can be received and fixed or can Mounted rotationally in the support eye. Depending on the applied actuating torque, one gear element of the adjusting gear is coupled to and supported on the associated fork leg of the seat cushion-side frame part, while the other gear element can be supported on the backrest-side frame part. By means of the adjusting gear, the driving torque generated electrically or manually is converted into an adjusting torque, which acts between the fork legs and the backrest-side frame part and enables the desired inclination angle adjustment.

There are many possibilities within the framework of the invention for the structural configuration of the seat cushion-side frame parts, in particular the configuration of the base legs on the one hand and the fork legs on the other hand. In one proposal of the invention, the base leg and a fork leg, in particular the transversely inner fork leg, form a one-piece base body. The other fork leg is then detachably mounted, for example screwed, to the one-piece base body. This simplifies assembly, for example, in which a connecting pipe, which in some cases may already have a coupling rocker fastened to it, is first mounted on the one-piece base body. This partial assembly unit is then assembled on the backrest-side frame part, wherein the adjustment gear can already be assembled in this assembly step, or the adjustment gear can be assembled in a subsequent assembly step, in which case In this step, the other fork leg is assembled on the one-piece base body. Thus, the other fork leg can be externally attached to the base body and mounted thereon, for example by using fastening screws.

In principle, the backrest and side frame parts can also be constructed in one piece or in multiple pieces. In one proposal of the invention, the backrest and side frame parts respectively have supporting eyes and a backrest part. This support eye-backrest part has a relatively small extent in the height direction of the backrest when the backrest is oriented vertically, and has only the support eye and the fastening section. The backrest-side frame part then also has a longitudinal strut-backrest part. The longitudinal strut-backrest part has a fastening area which can be detachably mounted with the support eye fastening area of the backrest part, in particular by means of fastening screws. Furthermore, the longitudinal strut-backrest part has a longer section which extends along the backrest in the direction of its upper end. Here, it is possible that the longitudinal strut-backrest unit can be inserted precisely with its fastening area into the fastening area of the support eye-backrest part, wherein the connection provided in this way can be achieved by fastening screws secure or secure. For this configuration, the support eye-backrest part is connected to one another by at least one connecting strut.

Advantageous developments of the invention emerge from the alternative embodiments, the description and the drawings.

The advantages of features and combinations of features mentioned in the description are merely exemplary and may have alternative or cumulative effects, and these advantages do not necessarily have to be realized by embodiments of the invention.

The following applies with respect to the disclosure of the original application document and the present patent (rather than to the scope of protection): further conclusions can be drawn from the drawings, in particular the geometry shown and the relative dimensions of the various components relative to one another, as well as their relative arrangement and operative connection. Characteristics. Combinations of features of different embodiments of the invention or features of different claims may also deviate from selected referencing of the claims and are indicated here. This also applies to those features shown in separate figures or mentioned in their description. These features can also be combined with features of different claims. Likewise, features listed in the claims may be omitted for other embodiments of the invention, but this does not apply to the independent claims of the granted patent.

Features mentioned in the claims and description are to be understood as having an amount of exactly this amount or greater than the stated amount, without the need for explicit use of the adverb "at least". Thus, for example, when an element is mentioned, it is understood that exactly one element, two elements, or more are present. The features mentioned in the claims may be supplemented by other features or may be the only features that are the subject matter of the respective claims.

Reference signs contained in a claim shall not be construed as limiting the scope of the subject matter protected by the claim. They are only intended to make the claims easier to understand.

Description of drawings

The invention is further explained and described below with the aid of preferred embodiments shown in the drawings.

Figure 1 shows a simplified side view of a partial fragment of the load-bearing structure of a motor vehicle seat.

FIG. 2 shows the motor vehicle seat according to FIG. 1 in a perspective detail view from the front.

FIGS. 3 and 4 show details of the motor vehicle seat according to FIGS. 1 and 2 in different spatial views.

FIG. 5 shows a spatial view of the seat cushion-side frame part of the motor vehicle seat according to FIGS. 1 to 4 , wherein the seat cushion-side frame part is formed with a base body which forms the base legs and the fork legs and which can be mounted on Another fork leg on it.

FIG. 6 shows details of the motor vehicle seat according to FIGS. 1 to 5 in the region of the backrest inclination adjustment device in a sectional view from above.

7 to 10 show further configurations of motor vehicle seats in different spatially detailed views.

FIG. 11 shows a space exploded view of the connecting tube, the rear coupling rocker arm, the base body of the seat cushion-side frame part, the backrest-side frame part, the adjusting gear and the fork legs of the seat cushion-side frame part and the coupling rod.

FIG. 12 shows the adjustment gear of the backrest inclination adjustment in a very schematic spatial view.

Figure 13 schematically shows a side view of a motor vehicle seat, which includes a seat cushion and a backrest cushion, the inclination of the backrest being adapted to the sitting position.

Figure 14 shows the motor vehicle seat according to figure 13 with its seat and backrest cushions in a lying position.

Detailed ways

FIG. 1 shows a fragment of a motor vehicle seat 1 with a mechanical load-bearing and frame structure. The motor vehicle seat 1 is supported on the floor of the vehicle via a longitudinal rail 2 , wherein the motor vehicle seat 1 can be moved along the longitudinal rail 2 by mechanisms not explained in detail here and can be fixed in different positions. The motor vehicle seat 1 has a seat cushion frame 3 and a backrest frame 4 . The seat cushion frame 3 carries the seat cushion and the backrest frame 4 carries the backrest cushion. The seat frame 3 has two parallel seat-side frame parts 5 and the backrest frame 4 has two parallel backrest-side frame parts 6 . The side frame parts 5 , 6 can be integral components of the other components of the frame 3 , 4 or can be materially connected to the other components, in particular by welding or gluing or otherwise connected thereto, in particular Is through screws, rivets, etc. The side frame parts 5, 6 themselves can be formed in one piece or in multiple pieces, wherein the individual sections can also be connected to one another by welding or other connection methods. The side frame parts 5 , 6 are preferably produced by a plastic shaping method, in particular a molding or pressing method or a deep drawing method.

The seat frame 3 is supported on both transverse sides by a four-bar mechanism 7 on the longitudinal rail 2 . The four-bar mechanism 7 has a front coupling rocker arm 8 and a rear coupling rocker arm 9 . The coupling rockers 8 , 9 are each articulated in the lower end region via a pivot bearing 10 , 11 on a bearing seat which is guided movably and securely on the longitudinal rail 2 . In the upper end region, these coupling rockers 8 , 9 are respectively articulated to the seat cushion side frame part 5 via pivot bearings 12 , 13 . The four-bar mechanism 7 formed in this way is schematically shown in FIG. 1 with dashed lines.

The motor vehicle seat 1 has a seat height adjustment device 14 of a known design in principle. For the embodiment shown, the rack 15 is articulated on the longitudinal rail 2 (displaceable in the longitudinal direction with the longitudinal movement of the motor vehicle seat 1 ). The pinion of the seat height adjustment drive 16 (optionally with a transmission arranged in the force flow) is engaged with the toothed rack 15 and is held on the seat cushion frame 3 , here on the seat cushion side frame part. 5 on. It is possible for the seat height adjustment drive 16 (with possible transmission and/or pinion) to be integrated in the open interior of the seat cushion side frame part 5 or held thereon. If the seat height adjustment drive 16 is moved along the rack 15 due to the rotation of the pinion, an adjustment of the articulation angle of the four-bar mechanism 7 occurs, which is accompanied by an adjustment of the height H of the motor vehicle seat 1 . Depending on the kinematic design of the four-bar mechanism 7 , the adjustment of the height H of the motor vehicle seat 1 can also be related to changes in the inclination of the seat cushion frame 3 and the seat cushion-side frame part 5 .

Furthermore, the motor vehicle seat 1 has a backrest inclination adjustment device 17 , which is also referred to as a “recliner” in the prior art. The recliner can adjust the tilt angle of the backrest frame 4 relative to the seat cushion frame 3 . In this case, the backrest inclination adjustment device 17 can be designed manually, with an actuating mechanism such as a steering wheel or a joystick, to which a person sitting on the motor vehicle seat 1 can exert an actuating force, which can then be used by the backrest inclination adjustment device. The 17-inch transmission converts the operating force into an adjustment torque for adjusting the backrest tilt. It is also possible for the backrest inclination adjustment device 17 to be driven by an electric motor.

In principle, any such device known in the art can be used for the seat height adjustment device 14 and the backrest inclination adjustment device 17 . Without being restricted to these embodiments, the seat height adjustment device 14 can also not act on the seat cushion side frame part 5 (as in the embodiment shown), but instead can be coupled to the rocker arm 8 or 9 The meshing of circumferential teeth produces regulating torque. The seat height adjustment device 14 can also be designed manually, as is known in the art. Further examples of the configuration of the backrest inclination adjustment device 17 which do not limit the invention can be derived, for example, from utility models DE 20 2020 107 166 U1 and DE 10 2020 122 541 A1 as well as from the prior art cited therein. Without limiting these embodiments, with regard to the backrest inclination adjustment device 17 and the transmission device contained therein or the design of the recliner, reference may be made to the publications CN 215097153 U, DE 10 2020 114 396 A1, and the unpreviously published patent application DE2022 103 376.7, DE 10 2022 103 377.5, DE 10 2022 103 378.3. It can also be seen from the publication explained above that the seat height adjustment device 14 can include an unlocking device for the backrest, so that the backrest can be manually deflected forwards, for example to enable passengers to enter the vehicle through the front door of the vehicle. the rear cabin. Automatic unlocking of the longitudinal locking device for moving the motor vehicle seat 1 along the longitudinal rail 2 can also be integrated into the backrest inclination adjustment device 17 . In this way, the so-called "easy entry function" is ensured.

Any other units may be integrated into the seat cushion frame 3 and the backrest frame 4, such as heating devices, ventilation devices, massage devices, etc.

It can be seen from FIGS. 2 to 4 , in particular FIG. 5 , that the seat cushion side frame part 5 is configured in the rear end region in a Y-shape or fork shape in a vertical view from above, with the fork or the Y The base leg 18 and the two fork legs 19 , 20 branching off from the base leg 18 . It is possible that (unlike a classic "Y" or fork) the laterally outer fork leg 20 on the motor vehicle seat 1 forms a smaller angle with respect to the base leg 18 or is even an extension of this base leg 18 (cf. Figure 5). As can be seen from the exploded view according to FIG. 5 , the transversely inner fork leg 19 and the base leg 18 are formed as a one-piece base body 21 to which the fork leg 20 can then be mounted, in particular by screwing. Preferably, the structural elements forming the base legs 18 and the fork legs 19, 20 are designed as open or closed box profiles.

The fork legs 19, 20 have supporting eyes 22, 23 respectively. The fork legs 19 , 20 are here curved, so that the supporting eyes 22 , 23 are arranged in parallel planes. Although in principle it is also possible for the bearing eye axes 33 , 31 of the bearing eyes 22 , 23 to be arranged coaxially with respect to one another, for the embodiment shown the bearing eye axes 33 , 31 of the bearing eyes 22 , 23 have in the case of a parallel orientation Offset 34, which will be explained below. The purpose of the support eyes 22 , 23 is to receive and rotatably support components of the backrest inclination adjustment device 17 and to support the backrest frame 4 pivotably relative to the seat cushion frame 3 upon actuation of the backrest inclination adjustment device 17 .

As can be seen in FIG. 4 , the backrest-side frame part 6 is arranged between the fork legs 19 , 20 . Here too, the backrest-side frame part 6 has support eyes 24 . In the exemplary embodiment shown, the bearing eye axis 32 of the bearing eye 24 of the backrest-side frame part 6 is arranged coaxially with the bearing eye axis 31 of the bearing eye 23 of the fork leg 20 .

A connecting tube 25 is rotatably supported in the bearing eye 22 in such a way that it has only a degree of freedom of rotation relative to the seat cushion side frame part 5 . The function of the connecting tube 25 is to connect the seat cushion-side frame parts 5 arranged on two lateral sides in the rear end region to form the seat cushion frame 3 .

In particular, it can be seen in FIG. 6 that one end region of the rear coupling rocker arm 9 is equipped with a bearing eye 26 . In the area of this bearing eye 26 , the coupling rocker 9 is connected to the connecting tube 25 in a torsionally fixed manner. This is ensured by the shaping process of the connecting tube 25 in such a way that the bulge visible in FIG. 6 forms a positive fit. and/or interacts with the bearing eye 26 in a friction-fit manner, so that there is a fastening between the connecting tube 25 and the coupling rocker arm 9 without remaining degrees of freedom.

In the exemplary embodiment shown, the connecting tube 25 is connected to the rear coupling rocker arm 9 in a rotationally fixed manner, while the connecting tube 25 is mounted rotatably relative to the seat cushion side frame part 5 . Alternatively, an embodiment is also possible in which the coupling rocker arm 9 is mounted rotatably on a connecting tube 25 which is connected in a rotationally fixed manner to the bearing eye 19 of the seat cushion side frame part 5 .

It can also be seen in FIG. 6 that the first transmission part 27 of the backrest inclination adjustment device 17 is integrated inside the support eye 20 and/or is arranged or captured or received in the fork legs 20 and the backrest side frame part 6 while the second transmission part 28 of the backrest inclination adjustment device 17 interacting with the first transmission part 27 can be captured, arranged or received between the fork legs 19 and the backrest-side frame part 6 .

It can also be seen in Figure 6 that a coupling rod 29 is present. The coupling rod 29 mechanically couples the backrest inclination adjustment units 44 , 45 of the backrest inclination adjustment device 17 to each other on both sides of the motor vehicle seat 1 by transmitting a coupling torque, so that on the one hand, the tilting The tilt is adjusted evenly on both sides and, on the other hand, support of the load acting on the backrest by means of the two backrest tilt-adjusting units 44 , 45 is also ensured when the backrest tilt-adjusting unit is locked. The coupling rod 29 extends through the inner space 30 of the connecting tube 25 , the bearing eye 26 , the bearing eye 22 of the fork leg 19 , the bearing eye 24 of the backrest-side frame part 6 and the bearing eye 23 of the fork leg 20 , wherein the The coupling rod 29 can also extend at least partially or, as shown here, completely through the transmission parts 27 , 28 of the backrest inclination adjustment device 17 .

In the view according to FIG. 6 , it can be seen that the longitudinal axis of the coupling rod 29 is displaced forward in projection on the horizontal plane relative to the longitudinal axis of the connecting tube 25 by an offset component, wherein this offset component is in particular the connecting tube 25 The radius of the inner space 30 is 5% to 50% or 5% to 40% or 10% to 30%, provided that the connecting pipe 25 has a circular cross-section. It is also possible that the deflection component of the coupling rod 29 runs downwards in the projection on the vertical plane relative to the longitudinal axis of the connecting tube 25 , in which case this would be directed downwards if the connecting tube 25 had a circular cross-section. The lower offset component may be 5% to 50% or 5% to 40% or 10% to 30% of the radius of the inner space 30 of the connecting pipe 25 .

In FIG. 6 , the bearing eye axes 31 , 32 of the bearing eyes 24 of the backrest-side frame part 6 and the bearing eyes 23 of the fork legs 20 are shown on the one hand and the bearing eye axes of the bearing eyes 22 of the fork legs 11 on the other hand. 33, they have an offset of 34. The bearing eye axes 31 , 32 may correspond here to the adjustment axis 35 of the backrest inclination adjustment device 17 and/or to the adjustment axis about which the backrest rotates when the inclination of the backrest changes. The offset 34 may in particular consist of a vertical offset component and a horizontal offset component.

It can be seen in particular in FIGS. 7 , 8 , 9 and 10 that the backrest-side frame part 6 consists of two parts, with a support eye-backrest part 36 forming a support eye 24 and with a longitudinal strut backrest part 37 , which The longitudinal strut backrest section extends over a large part of the backrest side and in particular to the upper end region of the backrest frame 4 . The support eye-backrest part 36 and the longitudinal strut backrest part 37 are inserted into each other with an exact fit and are screwed to each other via fastening screws 38 . The right and left supporting eye-backrest parts 36 are connected to each other by at least one connecting strut 39a, 39b, which are firmly connected to the supporting eye-backrest part 36 by screws, welding, caulking or other means. On the contrary, the longitudinal strut-backrest part 37 is connected indirectly in the lower end region via the connecting strut 39 of the supporting eye-backrest part 36 , no additional direct connection is provided on the longitudinal strut-backrest part 37 in the lower end region. Connect the strut 39. Instead, at least one connecting strut oriented in the transverse direction can be fastened to the longitudinal strut-backrest part 37 in the middle or upper end region of the seat cushion frame 3 .

The two-piece design of the backrest-side frame part 6 enables production on a production line in which initially only the seat frame 3 with the associated structural parts is arranged and in the case of the backrest frame 4 only with the connecting supports Support eye for rod 39 - backrest portion 36 . Other components can then be installed on this partially assembled unit. In particular, assembly can be carried out together with the seat height adjustment device 14 and/or the backrest tilt adjustment device 17 , since all structural parts that are part of the backrest tilt adjustment device 17 or are connected thereto are present in the support. The eye-back part 36 is or can be mounted on this supporting eye-back part. The upper part of the backrest is only installed in a later assembly step. In particular, in a subsequent assembly step, the longitudinal strut backrest part 37 can be inserted into the supporting eye backrest part 36 and then fastened by means of the fastening screws 38 .

As further details, it can be seen in FIG. 7 that the backrest inclination adjustment device 17 can be driven by an electric backrest inclination adjustment drive 40 . In the partial assembly step described, the backrest inclination adjustment drive 40 can also already be mounted on this partial assembly unit, since the longitudinal strut backrest part 37 has not yet been installed, wherein, as shown in FIG. 7 , the backrest inclination - An end region of the adjustment drive 40 can project upwards from the partial assembly unit. With the connection of the longitudinal strut backrest part 37 to the support eye backrest part 36 , an engagement occurs adjacent to the backrest inclination adjustment drive 40 , wherein it is also possible to engage the upper end of the backrest inclination adjustment drive 40 The bottom area can also be accessed into the downwardly open interior of the longitudinal strut backrest section 37 .

As can be seen in the exploded view according to FIG. 11 , the backrest inclination adjustment device 17 can have an adjustment gear 41 . Here, it is possible for the adjusting gear 41 to have gear parts 27 , 28 . For the embodiment shown in FIG. 11 , the adjustment gear 41 or at least one gear part 27 , 28 thereof is mounted on the base leg 20 of the seat cushion-side frame part 5 and on the backrest-side frame part 6 , in particular on the supporting eye-backrest. between portions 36 , in which the bearing eyes 23 , 24 can be used to guide the rotation of the gear element or the escapement wheel of the regulating gear 41 .

In FIG. 12 , the adjusting gear 41 with its various components is shown in a highly simplified form (the individual tooth connections are not shown).

FIG. 13 shows a motor vehicle seat 1 with a seat cushion 42 held by a seat cushion frame 3 and a backrest cushion 43 held by a backrest frame 4 .

Here too, an offset 34 can be seen between the bearing eye axes 31 , 32 and thus between the adjustment axis 35 on the one hand and the bearing eye axis 33 on the other hand. In this case, the offset 34 has not only a forward offset component in the horizontal direction but also an approximately equal downward offset component in the vertical direction.

Figure 14 shows the backrest of the motor vehicle seat 1 tilted into a lying down position. It can be seen here that the configuration according to the invention and the selection of the offset 34 explained above provide a straightened support surface for the person lying on the motor vehicle seat 1 .

List of reference signs

1motor vehicle seat

2 longitudinal tracks

3 seat cushion frame

4 backrest frame

5 seat cushion-side frame part

6Backrest-side frame part

7 four-bar mechanism

8 front coupled rocker arms

9 rear coupling rocker arm

10 pivot bearings

11 pivot bearing

12 pivot bearings

13 pivot bearing

14 Seat Height-Device

15 rack

16 seat height-adjustable drive

17 Backrest inclination-adjustment device

18 base legs

19 fork legs

20 fork legs

21 matrix

22 (fork leg 19) support eye

23 (fork leg 20) support eye

24 (backrest-side frame part 6) support eye

25 connecting pipe

26 (coupling rocker arm 9) support eye

27 transmission part

28 transmission part

29 coupling rod

30 space

31 (the supporting eye axis of the supporting eye 23 of the fork leg 20)

32 (axis of the supporting eye 24 of the backrest-side frame part 6)

33 (the supporting eye axis of the supporting eye 22 of the fork leg 19)

34 offset

35 (backrest inclination adjustment device 17) adjustment axis

36 support eyes - backrest part

37 Longitudinal strut-backrest part

38 fastening screws

39 connecting strut

40° backrest tilt-adjustable drive

41Adjust transmission device

42 seat cushion

43 back cushion

44 backrest inclination-adjustment device

45° backrest inclination-adjustment.

Claims (11)

1. A motor vehicle seat (1), having a) A seat frame (3) having a seat-side frame part (5) and supported relative to the floor by a four-bar mechanism (7) with front and rear coupling rockers (8, 9) at the height H; b) a backrest frame (4) having a backrest-side frame portion (6); c) Seat height-adjusting device (14) for changing the height H of the seat cushion frame (3); and d) Backrest inclination-adjustment device (17) for changing the inclination of the backrest frame (4) relative to the seat cushion frame (3) around the adjustment axis (35); e) connecting tube (25) connecting the two seat cushion-side frame parts (5) to each other and to the rear coupling rocker arm (9); It is characterized by: f) The adjustment axis (35) extends through the cross section of the connecting tube (25). 2. Motor vehicle seat (1) according to claim 1, characterized in that, a) the backrest inclination adjustment device (17) has a right backrest inclination adjustment unit (44) and a left backrest inclination adjustment unit (45), which are coupled to each other via a coupling rod (29), and b) The coupling rod (29) extends through the connecting tube (25). 3. Motor vehicle seat (1) according to one of the preceding claims, characterized in that the adjustment axis (35) and/or the coupling rod (29) extend with an offset (34) through the connecting tube (25). 4. Motor vehicle seat (1) according to one of the preceding claims, characterized in that the seat cushion-side frame part (5) is Y-shaped or fork-shaped and has a base leg (18) and two fork legs. (19,20). 5. Motor vehicle seat (1) according to claim 4, characterized in that, a) A fork leg (19) is connected to the seat height adjustment device (14) or the rear coupling rocker arm (9), so that the seat height of the seat height adjustment device (14) or the coupling rocker arm (9) is adjusted The holding force and/or the seat height adjustment force is transmitted via the fork legs (19) to the seat cushion-side frame part (5) and/or is supported on the seat cushion-side frame part (5), and b) The other fork leg (20) is connected to the backrest inclination adjustment device (17), so that the backrest inclination maintaining force and/or the backrest inclination adjustment force is transmitted to the seat cushion through the other fork leg (20) - The side frame parts (5) and/or are supported on the seat cushion-side frame parts (5). 6. Motor vehicle seat (1) according to claim 4 or 5, characterized in that the backrest-side frame part (6) is arranged between the two fork legs (19, 20). 7. Motor vehicle seat (1) according to one of claims 4 to 6, characterized in that the fork legs (19, 20) each have a support eye (22, 23). 8. Motor vehicle seat (1) according to claim 7, characterized in that the supporting eye axes (33, 31) of the supporting eyes (22, 23) of the fork legs (19, 20) are offset (34 ) arranged relative to each other. 9. Motor vehicle seat (1) according to claim 7 or 8, characterized in that, a) between the support eye (24) of the backrest-side frame part (6) and the fork legs (20) arranged on the outside and/or b) between the support eye (24) of the backrest-side frame part (6) and the fork legs (19) arranged inside An adjustment gear (41) or gear parts (27, 28) of the backrest inclination adjustment device (17) are arranged. 10. Motor vehicle seat (1) according to one of claims 4 to 9, characterized in that the base leg (18) and one fork leg (19) form a one-piece base body (21) and the other fork leg (19) The legs (20) are mounted on the base body (21). 11. Motor vehicle seat (1) according to one of the preceding claims, characterized in that the backrest-side frame parts (6) each have a support eye-backrest part (36) and a longitudinal strut-backrest part (37), in, a) Support eye-backrest parts (36) are connected to each other via connecting struts (39) and/or b) The longitudinal strut-backrest part (37) is mounted on the support eye-backrest part (36).